3.2Ma BP以来河北黄骅地区孢粉地层学与古气候变迁  

PALYNOLOGY STRATIGRAPHY AND PALAEOCLIMATE EVOLUTION IN HUANGHUA DISTRICT OF HEBEI PROVINCE SINCE 3.2 MA BP

作　　者：范淑贤[1] 刘海坤[1] 赵华[1] 吉云平[1] 毛洪亮[1] 

机构地区：[1]中国地质科学院水文地质环境地质研究所,河北石家庄050061

出　　处：《微体古生物学报》2009年第2期173-180,共8页Acta Micropalaeontologica Sinica

基　　金：中国地质调查局地质调查项目(200312300002)

摘　　要：依据河北省黄骅市八里庄村HB1孔孢粉、古地磁和光释光等资料,发现第四纪以来渤海西岸的古植被演变受气候变化的影响,也受沉积环境的制约。1.6—3.2MaBP期间河流发育时期孢粉不丰富;孢粉富集带多出现在湖相地层,而且持续时间短,孢粉贫乏带多出现在河流相沉积地层,持续时间较长;0.8—1.6MaBP期间植被以疏林草原为主,局部草原存在,古气候温和偏干。0.13MaBP以来,随着明显的古季风变化,孢粉丰富,气候序列分辨率高,可与海洋氧同位素分期对比;11kaBP以来气候变暖湿润,为针阔叶混交林草原或沼泽草甸植被,3kaBP之后为海退时期,气候变凉变干,植被由沼泽草甸演变为盐生草甸。尽管该孔是目前沿海平原深孔分析孢粉样品最密的钻孔,但是未能发现连续丰富的孢粉,可能与该孔位于相对较高部位,多与河流沉积环境有关;故而,平原区内并非每一个钻孔皆足以反映整个第四纪孢粉地层学的全貌。Based on the data of spore-pollen, palaeomagnetism and optically stimulated luminescence from Hole HB1, which is located at the Balizhuang village in Huanghua city,east Hebei Province. The evolution of palaeovegetation in the west coast of Bohai Sea since Quaternary is found not only to be impacted by the climate change but also domina- ted by the sediment environment. During the period of 1.6 3.2 Ma BP, when the rivers were developed, the spore- pollen was not rich; the spore-pollen enriched belt often occurred in lacustrine strata and lasted for a short time, while the spore-pollen deficient belt often occurred in river sediment and lasted a longer time. In the phase 0.8--1.6 Ma BP the palaeovegetation was dominated by veld, where the grasslands occurred at some regions when the paleoclimate was mild and slightly dry. Since 0.13 Ma BP to the present, with obviously palaeomonsoon change the spore-pollen was rich and the resolution of the climate sequence was high, which could be compared to the curve of ocean oxygen isotope. Since 11 ka BP the climate became warm and humid, and the vegetation was mixed coniferous broad leaved forest grass or swamp meadow. Since 3 ka BP, the climate became cool and dry, and the vegetation turned to halo- phyte meadow from the swamp meadow. Although the sampling density of spore-pollen analysis at this drilling hole is the highest in the holes on the coastal plain at present, but there is no continuous rich spore-pollen sequence, possibly because that Hole HB1 located at a higher place and impacted by the river sediments environment. Thus, the spore- pollen stratigraphy in the whole Quaternary cannot he reflected through one borehole study in the plain area.

关 键 词：孢粉记录 第四纪 古植被 古气候 黄骅 渤海湾西岸 

分 类 号：Q913[天文地球—古生物学与地层学]